Thanks, yes this is Amd socket A block. I just tested this block with air preasure under water and no leaks, now I'm encouraged and will use full plexy top for final block.
And good news for P4 users, I dug out intel specs. for heatsink mounting and I will now also make P4 version of that block, and also it will bi 50x50 TEC thick copper plate ready
Now on to testing.